Here is my weekly weather quiz question for the last time. What is an“Acre-foot?” Here is the correct answer. An Acre-foot is the amount of water required to cover one acre to a depth of one foot. An acre-foot equals 326,851 gallons, or 43,560 cubic feet. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer at the bottom of this page. An email will not suffice. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An upper level high pressure ridge (Shaded “Arch” shape with blue arrows) will be sending us airflow from the Northwest then another upper level trough of low pressure (Shaded “U” shape with blue arrows) moves in behind it. The days 1-3 graphic shows the storm that moisture will still be moving over us with some warmer air. A lot of the ice has been melting today, but cold overnight temperatures will freeze what is still wet. The combination of the branches rising with melting and being refrozen could result in more trees and branches  falling. The graphic for days 3-7 shows the next storms headed our way Tuesday and Thursday. For mountain snow conditions at the local ski areas check out their websites or give them a call.

Note: Just in case you haven’t noticed “THIS ISN”T WINTER YET!” The Winter Solstice falls on Thursday December 22nd at 2:44 AM PST. I hope this current weather pattern isn’t the precursor to a very active Winter Storm season.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 33 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Home Wood Heating Advisory:

Eugene-Springfield: YELLOW- Caution is Advised.

Oakridge: YELLOW- Caution is Advised.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A FROST ADVISORY IS IN EFFECT FROM 10 PM THIS EVENING UNTIL 7 AM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.
• A Blue-Green Algae Health Advisory HAS BEEN CANCELLED for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the blue-green algae bloom is no longer present.

 

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with a slight (20%) chance of rain and snow showers this evening, just mostly cloudy late tonight,
• Just mostly cloudy and a bit warmer Sunday, a slight (20%) chance of rain late at night,
• Mostly cloudy and a bit warmer with rain Monday (0.25 in. of rain possible), rain, possibly heavy at times, Monday night (0.75 in. of rain possible),
• Mostly cloudy with rain, breezy and a bit warmer Tuesday, then a slight (20%) chance of showers at night.
• lows 25-40 cooling to 34 Tuesday night highs 39-49.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain Wednesday night,
• Mostly cloudy with rain likely (70%) Thursday, showers likely (70%) at night,
• A good (50%) chance of showers Friday, a (40%) chance of showers Friday night,
• Then cloudy with a good (50%) chance of showers Saturday.
• highs near 43 lows near 35. (seasonal averages high 45 low 33)

 

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Forecast for Roseburg:

• Mostly cloudy and a bit warmer tonight through Sunday night,
• Cloudy  with a (40%) chance of AM rain (snow level 3,000 ft), rain and a bit warmer Monday afternoon (0.10 in. of rain possible), cloudy with a good (50%) chance of evening rain, then rain late Monday night (0.25 in. of rain possible),
• Mostly cloudy with AM rain, rain likely (70%) and a bit warmer Tuesday, mostly cloudy with a slight (20%) chance of showers Tuesday evening, then just mostly cloudy at night.
• lows 29-39 highs 42-49.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a (40%) chance of rain at night,
• AM rain, showers and a bit warmer Thursday afternoon, evening showers likely (70%), rain and snow showers likely (70%) late Thursday night,
• Mostly cloudy with a (40%) chance of  rain and snow showers and a bit cooler Friday and Friday night,
• Then cloudy with a (30%) chance of showers Saturday.
• highs 44-47 cooling back to 44 Saturday lows 40-36. (seasonal averages high 47 low 36)

 

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy tonight and Sunday (a bit warmer), mostly cloudy with a slight (20%) chance of coastal rain late Sunday night,
• Mostly cloudy with AM coastal rain likely (70%) and a (30%) chance of coastal rain and a bit warmer Monday afternoon while a good (50%) chance of inland rain (0.25 in. of rain possible), a good (50%) chance of rain late at night (0.50 in. of rain possible),
• Mostly cloudy with AM rain, a bit warmer with rain likely (70%) and breezy Tuesday, just mostly cloudy at night.
• lows 33-46 cooling to 38 Tuesday night highs 48-53.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain at night,
• Rain Thursday AM, showers and a bit cooler in the afternoon, showers likely (70%) Thursday night,
• Mostly cloudy with a (40%) chance of showers and a bit cooler Friday and at night,
• Then cloudy with a (30%) chance of showers Saturday.
• highs 52-48 lows 43-39.(seasonal averages high 51 low 39)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a slight (20%) chance of evening snow showers, just mostly cloudy late tonight,
• A mix of clouds and sun and a bit warmer Sunday, just mostly cloudy at night,
• Cloudy with a good (50%) chance of AM snow, snow and rain and a bit warmer Monday afternoon, rain Monday night,
• Cloudy with rain and snow and a bit warmer and breezy Tuesday, then mostly cloudy with a good (50%) chance of rain and snow showers Tuesday night.
• snow level at the surface tonight, free air freezing level at the surface Sunday and Sunday night, snow level 2,500 ft. rising to 4,000 ft. Monday afternoon, 7,000 ft. Monday night, 5,500 ft. Tuesday, then 3,500 ft. Tuesday night.
• lows 10-29 cooling to 22 Tuesday night highs 32-36.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain and snow  Wednesday night,
• Mostly cloudy and a bit cooler with snow and rain Thursday, snow showers at night,
• A good (50%) chance of snow showers Friday, a (40%) chance of snow showers Friday night,
• Then mostly cloudy with a good (50%) chance of snow showers Saturday.
• free air freezing level at the surface Wednesday, snow level 5,000 ft. Wednesday night, 3,500 ft. Thursday, 2,500 ft. Thursday night, at the surface Friday and Friday night, then 2,500 ft. Saturday.
• highs 34-32 lows 24-22.

 

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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